Germany, Airmail, 1930, 2m-4m So. America Flight Zeppelins complete. 2m with minor nibbed perf, all tied by "Friedrichshafen, 18.5.30" cds on First South American Round Flight card, red German and purple U.S. flight cachets, June 6 receiving postmark, fresh and Very Fine. Michel No. 438-439. Scott No. C38-C39  Estimate $300 - 400. $0 (Image)